Process and composition for separating plasma or serum from whole blood

• US 4,477,575 A
• Filed: 08/04/1981
• Issued: 10/16/1984
• Est. Priority Date: 08/05/1980
• Status: Expired due to Term

• Current Assignee: Boehringer Mannheim GmbH (Roche Holding AG)
• Original Assignee: Boehringer Mannheim GmbH (Roche Holding AG)
• Inventors: Werner, Wolfgang, Braun, Hans-Peter, Vogel, Peter, Berger, Dieter
• Primary Examiner(s): Turk, Arnold
• Application Number:
  US06/289,943
• Time in Patent Office: 1,169 Days
• Field of Search: 210/500.1, 210/782, 210/927, 210/503, 210/505, 210/508, 210/767, 210/509, 23/230 B, 422/55, 422/56, 422/57, 422/58, 436/177, 436/178, 436/170, 73/64.1
• US Class Current: 436/170
• CPC Class Codes: B01D 39/2017 the material being filamentary or fibrous
• CPC Class Codes: G01N 33/48 Biological material, e.g. blood, urine G01N33/02, G01N33/26, G01N33/44, G01N33/46 take precedence; Haemocytometers counting blood corpuscules distributed over a surface by scanning the surface G06M11/02
• CPC Class Codes: G01N 33/491 by separating the blood components G01N15/05 takes precedence
• CPC Class Codes: G01N 33/525 Multi-layer analytical elements
• CPC Class Codes: Y10T 436/25375 Liberation or purification of sample or separation of material from a sample [e.g., filtering, centrifuging, etc.]

Abstract

A composition and process for permitting the separation of plasma or serum from whole blood. The composition includes glass fibers having an average diameter of from 0.2μ to 5μ and a density of 0.1 g/cm² to 0.5 g/cm². The process includes the steps of slowly trickling whole blood onto one side of a layer composed of the composition of glass fibers, whereby plasma or serum separated from the blood becomes available at another side of the layer. The total volume of the plasma or serum separated from the blood is limited to at most 50% of the absorption volume of the glass fiber layer.

Claims

1. A process for separating plasma or serum from whole blood, comprising:

trickling blood slowly onto a layer of glass fibers with an average diameter of 0.2 to 5μ and

a density of 0.1 to 0.5 g./cm³, the total volume of the plasma or serum to be separated being at most 50% of the absorption volume of the glass fiber layer; and

collecting the run-through from the glass fiber layer which is plasma or serum.

2. A process as claimed in claim 1, wherein the volume of plasma or serum to be separated is less than 30% of the absorption volume of the glass fiber layer.

3. A process as claimed in claim 2, wherein collecting the plasma comprises introducing the plasma directly into a diagnostic agent.

4. A process as claimed in claim 2, wherein collecting the plasma comprises taking it up in an absorbent carrier, and additionally comprising eluting the plasma into a diagnostic agent for the detection of the component materials thereof.

5. A process for separating plasma or serum from whole blood, comprising:

providing a layer of glass fibers having an average diameter of from 0.2μ

to 5μ and

a density of from 0.1 g/cm² to 0.5 g/cm² ;

slowly trickling whole blood onto one side of the layer of glass fibers, whereby plasma or serum separated from the blood becomes available at another side of the layer of glass fibers; and

limiting the total volume of the plasma or serum separated from the blood to at most 50% of the absorption volume of the glass fiber layer.

6. A process as in claim 5, wherein providing the layer of glass fibers comprises:

providing a layer of glass fibers having an average diameter of from 0.5μ

to 1.5μ

.

7. A process as in claim 5, wherein providing the layer of glass fibers comprises:

providing the layer of glass fibers mixed with synthetic resin fibers; and

additionally comprising;

consolidating the glass fiber layer with the synthetic resin fibers.

8. A process as in claim 5, wherein providing the layer of glass fibers comprises:

providing the layer of glass fibers mixed with at least one binding agent; and

additionally comprising;

consolidating the layer of glass fibers with the binding agent.

9. A process as in claim 5, and additionally comprising:

inserting the layer of glass fibers into a lower portion of a generally vertical hollow column before trickling the blood onto the layer of glass fibers, whereby the upper portion of the column is adapted to receive the blood and the lower portion of the column is adapted for discharging the plasma or serum.

10. A process as in claim 5, and additionally comprising:

placing a diagnostic agent for detecting at least one component material of the plasma or serum in absorptive communication with the side of the layer of glass fibers from which the plasma or serum is available,

whereby the plasma or serum is absorbed into the diagnostic agent for indicating the component material thereof.

11. A process as in claim 10, wherein the side of the layer of glass fibers in absorbant communication with the diagnostic agent comprises a portion of the side of the layer of glass fibers which receives the blood.

12. A process as in claim 10, wherein placing the diagnostic agent in absorptive communication with the layer of glass fibers comprises:

providing a removable absorptive layer between the side of the glass fiber layer from which the plasma is available and the diagnostic agent; and

arranging the removable absorptive layer for separation from the diagnostic agent after the plasma or seum has been absorbed thereby,

whereby the layer of glass fibers is also removed from the diagnostic agent and the plasma- or serum-receiving surface of the diagnostic agent is exposed for its indication of the component material of the plasma or serum.

13. A process as in claim 12, and additionally comprising:

providing a substrate or carrier;

attaching another side of the diagnostic agent to the substrate; and

attaching at least temporarily a portion of the removable layer to the substrate.

14. A process as in claim 5, and additionally comprising:

providing a diagnostic agent capable of absorbing the plasma or serum from the side of the layer of glass fibers from which it is available for indicating at least one component material of the plasma or serum; and

providing means for connecting the diagnostic agent with the layer of glass fibers in such normally spaced relation thereto that the diagnostic agent may be pressed into absorptive communication with the side of the layer of glass fibers from which the plasma or serum is available when it is desired to initiate the indication of the component material in the diagnostic agent.

15. A process as in claim 14,

wherein the side of the layer of glass fibers from which the plasma or serum is available is a portion of the side of the layer of glass fibers which receives the blood;

and

additionally comprising providing a barrier extending across the side of the layer of glass fibers for separating the portion thereof,

whereby blood placed on the one portion of the layer of glass fibers will not flow across the surface of the layer of glass fibers to the other portion which provides the plasma or serum to the diagnostic agent.

16. A process as in claim 15, wherein providing the barrier also comprises providing the means for supporting the diagnostic agent in normally spaced relation to the portion of the layer of glass fibers from which the plasma or serum is available.